In an interview with Gazzetta dello Sport, picked up in AS, Poser, from Argentina, said Messi had taken a tip from his international colleague Martin Demichelis and consulted him.

"I am a good friend of Demichelis and he recommended he [Messi] visit me," Poser said. "After the World Cup, something changed. Messi had the intuition and humility to try and do something different in his professional life."

The 59-year-old kinesiologist, whose methods reportedly include the use of Bach flower remedies, emotional therapy and a balanced diet, said the change from processed to natural foods had allowed Messi to train with greater intensity.